CAJ | 학술논문

合成了两种胆甾液晶单体,4-烯丙氧基苯甲酸胆甾醇酯M1和4-{4-[（4-烯丙氧基）-苯甲酰氧基]丁氧羰基}苯甲酸胆甾醇酯M2。将两种单体按一定比例与含氢聚硅氧烷（PMHS）共聚得到了一系列侧链液晶聚合物P1-P6。采用红外光谱（FT-IR）、核磁共振（1 H NMR）、差示扫描量热（DSC）、偏光显微镜（POM）和X射线等手段对单体及聚合物的结构、液晶性能和相行为进行了表征。通过分析表明单体M1、M2和聚合物为热致胆甾型液晶,聚合物在常温具有选择性反射现象,在升温—降温—再升温的过程中反射波长随温度升高发生蓝移,且聚合物具有良好的热稳定性和可逆变色性。
합성료량충담치액정단체,4-희병양기분갑산담치순지M1화4-{4-[（4-희병양기）-분갑선양기]정양탄기}분갑산담치순지M2。장량충단체안일정비례여함경취규양완（PMHS）공취득도료일계렬측련액정취합물P1-P6。채용홍외광보（FT-IR）、핵자공진（1 H NMR）、차시소묘량열（DSC）、편광현미경（POM）화X사선등수단대단체급취합물적결구、액정성능화상행위진행료표정。통과분석표명단체M1、M2화취합물위열치담치형액정,취합물재상온구유선택성반사현상,재승온—강온—재승온적과정중반사파장수온도승고발생람이,차취합물구유량호적열은정성화가역변색성。
A series of side-chain liquid crystalline polymers（P1-P6） were synthesized with poly（methylhydrogeno）siloxane and two cholesteric liquid crystalline（LC） monomers 4-allyloxybenzoylcholeseterate（M1） and 4-{4-[（4-（allyloxyl）-benzoyl]-butyloxocarbonyl}-benzoatecholesteryl（M2）.The mesomorphic properties were investigated by fourier transform infrared（FT-IR）,proton nuclear magnetic resonance spectra（1H NMR）,differential scanning calorimetry（DSC）,thermogravimetric analyses（TGA）,polarizing optical microscopy（POM）,and X-ray diffraction（XRD） measurements.All the monomers and polymers show cholesteric mesophase with very wide mesophase temperature ranges.Polymer films demonstrate the reversible change of reflective color,and blue shift was observed from low temperatures to high temperatures on the first heating and cooling,even second heating,the results indicate that the polymers show nice thermal and optic stability.